<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="黑马头条"
      @click-left="$router.back()"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="loading">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div v-else-if="article.title" class="article-detail">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">
            {{ article.pubdate | relativeTime }}
          </div>
          <followUser
            :isFollowed="article.is_followed"
            :userId="article.aut_id"
            @updata-is_followed="article.is_followed = $event"
          ></followUser>
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div
          class="article-content markdown-body"
          v-html="article.content"
          ref="article-content"
        ></div>
        <van-divider>正文结束</van-divider>
        <!-- 底部区域 -->
        <div class="article-bottom">
          <van-button
            class="comment-btn"
            type="default"
            round
            size="small"
            @click="isPostshow = true"
            >写评论</van-button
          >
          <van-icon name="comment-o" :info="totalCommentCount" color="#777" />
          <!-- 收藏区域 -->
          <collectActive
            class="btn-item"
            v-model="article.is_collected"
            :articleId="article.art_id"
          ></collectActive>
          <!-- <van-icon color="#777" name="good-job-o" /> -->
          <!-- 点赞区域 -->
          <likeArticle
            class="btn-item"
            v-model="article.attitude"
            :articleId="article.art_id"
          ></likeArticle>
          <van-icon name="share" color="#777777"></van-icon>
        </div>
        <!-- /底部区域 -->
        <!-- 发布评论弹出层-->
        <van-popup v-model="isPostshow" position="bottom">
          <commentPost
            :target="article.art_id"
            @post-success="onPostSucess"
          ></commentPost>
        </van-popup>

        <!-- 评论区域 -->
        <commentList
          :source="article.art_id"
          @onload-success="totalCommentCount = $event.total_count"
          :list="commentlist"
          @reply-click="onReplyClick"
        ></commentList>
      </div>
      <!-- /加载完成-文章详情 -->
      <!-- 加载失败：404 -->
      <div class="error-wrap" v-else-if="errorStatus === 404">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div class="error-wrap" v-else>
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="loadArticle">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>
    <!-- 评论回复弹出框 -->
    <van-popup v-model="isReplyshow" position="bottom" style="height: 100%">
       <commentReply
       v-if="isReplyshow"
       :comment='currentComment'
       @close='isReplyshow=false'
       ></commentReply>
    </van-popup>
  </div>
</template>
<script>
import { getArticleById } from "@/api/atricle";
import { Loading } from "vant";
import { ImagePreview } from "vant";
import followUser from "@/components/follow-user";
import collectActive from "@/components/collect-active/collect-active.vue";
import likeArticle from "@/components/like-article/index.vue";
import commentList from "@/views/article/commentList.vue";
import commentPost from "@/views/article/commentPost.vue";
import commentReply  from '@/views/article/commentReply.vue'
export default {
  // 给所有的后代组件提供数据
  provide:function(){
    return{
      articleId:this.articleId
    }
  },
  name: "ArticleIndex",
  components: {
    followUser,
    collectActive,
    likeArticle,
    commentList,
    commentPost,
    commentReply
  },
  data() {
    return {
      article: {},
      loading: true,
      errorStatus: 0, //失败的状态
      totalCommentCount: 0, //评论数量
      isPostshow: false,
      commentlist: [],
      isReplyshow: false,
      currentComment:{}  //点击回复，展示对应的当前评论项
    };
  },
  props: {
    articleId: {
      // 可能传递过来的是BigNumber对象
      type: [Number, String, Object],
      required: true,
    },
  },
  created() {
    this.loadArticle();
  },
  methods: {
    async loadArticle() {
      try {
        const { data } = await getArticleById(this.articleId);
        // 人为模拟错误
        //  if(Math.random()>0.5){
        //   JSON.parse('123sdf4')
        // }
        this.article = data.data;
        // 初始化图片点击预览
        setTimeout(() => {
          this.previewImage();
        }, 1000);
      } catch (err) {
        if (err.response && err.response.status === 404) {
          this.errorStatus = 404;
        }
      }
      // 无论成功还是失败都关Loading
      this.loading = false;
    },
    previewImage() {
      // 得到所有的Img节点
      const articleContent = this.$refs["article-content"];
      const imgs = articleContent.querySelectorAll("img");
      const images = [];
      imgs.forEach((img, index) => {
        images.push(img.src);
        img.onclick = () => {
          ImagePreview({
            images,
            startPosition: 0,
          });
        };
      });
    },
     onPostSucess(data) {
      // 关闭弹出层
      this.isPostshow = false;
      this.commentlist.unshift(data.new_obj);

   
      this.totalCommentCount = this.commentlist.length;
    },
    onReplyClick(comment) {
      this.isReplyshow = true;
      this.currentComment=comment
    },
  },
};
</script>

<style scoped lang="less">
@import "./github-markdown";
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
